Ceramic base of high-voltage direct-current contactor and assembling method thereof

Abstract

The invention discloses a ceramic base of a high-voltage direct-current contactor and an assembling method thereof. The ceramic base comprises a ceramic base cavity and a contact (6) in threaded connection with the interior of the ceramic base cavity. According to the assembling method, the ceramic base cavity is integrally welded, and then the contact is installed in the ceramic base cavity. Thread adjustment of the contact is achieved, the height of the contact can be changed according to the design requirement, the height requirement of the contact can be completely met, and finally the contact gap is within the design range. The performance and quality consistency of the product are improved, and the reliability of separating the high voltage and the large current of the contact part is ensured. The contact is prevented from being influenced by high-temperature brazing, the hardness and the strength of the contact part are ensured, the fusion welding resistance and the adhesion resistance of the contact are improved, and the reliability of the large-load capacity of the contact during on-off is ensured.

Description

technical field [0001] The invention relates to a ceramic base of a high-voltage DC contactor and an assembly method thereof. Background technique [0002] With the development of science and technology, aeronautical devices have developed towards multi-function and multi-purpose. The more functions they have, the more equipment and components they use, all of which increase the demand for aeronautical power. High-voltage direct current is more efficient in completing these larger power supplies, so contactors for aviation are developing in the direction of high voltage. In addition, fewer cables are required for high-voltage direct current, which helps to optimize the power and weight ratio of aerospace vehicles. [0003] The sealed cavity of the traditional high-voltage DC contactor is a ceramic sealed structure, and the contacts located in the ceramic sealed structure cavity are fixed by welding, resulting in the non-adjustable height of the contacts installed in the cer...

AI Technical Summary

Problems solved by technology

[0003] The sealed cavity of the traditional high-voltage DC contactor is a ceramic sealed structure, and the contacts located in the ceramic sealed structure cavity are fixed by welding, resulting in the non-adjustable height of the contacts installed in the ceramic sealed structure cavity, making the contacts There is a certain difference in height, and the contact height installed in the ceramic sealed structure cavity cannot be changed later due to the difference in contact height on the contactor body, resulting in a gap between the two contacts that does not meet the design requirements, reducing contact The performance and quality consistency of the device, and the connection and disconnection of the dynamic and static contacts are easily affected by high voltage and high current

[0004] In addition, the contacts and other components in the ceramic sealed structure cavity in the traditional high-voltage DC contactor are welded by brazing at the same time, and affected by the characteristics of the brazing process, the contacts installed in the ceramic sealed structure cavity Generally only pure copper material can be used

However, since the welding temperature of ceramics and metals such as contacts is relatively high, generally around 800°C, and the time increases for several hours, and the annealing temperature of pure copper is generally lower than 600°C, therefore, the high temperature environment during brazing will As a result, the hardness of pure copper drops sharply, and eventually the hardness and strength of pure copper contacts are low. When breaking high voltage and high current loads, the wear resistance of the contacts is seriously reduced, and the resistance of the contacts to welding and adhesion Reduced, reducing the reliability and life performance of the entire contactor

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